1、Designation: C744 14C744 16Standard Specification forPrefaced Concrete and Calcium Silicate Masonry Units1This standard is issued under the fixed designation C744; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specification covers prefaced con
3、crete and calcium silicate masonry units with the exposed-to-view-in-placesurfacesfinished face(s) covered at the point of manufacture with resin, resin and inert filler, or cement and inert filler to producea smooth resinous tile facing.tile-like surface feature. This specification does not address
4、, and therefore is not applicable to,ground-face concrete masonry units that are manufactured by grinding a thin layer off the surface of a concrete masonry unit toexpose aggregates within and polishing to produce a smooth, architectural finish.1.2 The text of this specification references notes and
5、 footnotes which provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the standard.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversion
6、s to SI units that are provided for information only and are not considered standard.2. Referenced Documents2.1 ASTM Standards:2C55 Specification for Concrete Building BrickC73 Specification for Calcium Silicate Brick (Sand-Lime Brick)C90 Specification for Loadbearing Concrete Masonry UnitsC129 Spec
7、ification for Nonloadbearing Concrete Masonry UnitsC140 Test Methods for Sampling and Testing Concrete Masonry Units and Related UnitsC501 Test Method for Relative Resistance to Wear of Unglazed Ceramic Tile by the Taber AbraserC1232 Terminology of MasonryD822 Practice for Filtered Open-Flame Carbon
8、-Arc Exposures of Paint and Related CoatingsD2244 Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color CoordinatesD2486 Test Methods for Scrub Resistance of Wall PaintsE84 Test Method for Surface Burning Characteristics of Building Materials3. Termino
9、logy3.1 Terminology defined in Terminology C1232 shall apply for this specification.3.2 Definitions of Terms Specific to This Standard:3.2.1 prefaced concrete masonry unit, na concrete masonry unit where the exposed-to-view in-place surface(s) finishedface(s) are covered at the point of manufacture
10、with either resin, resin and an inert filler, or cement and an inert filler to producea smooth, resinous tile facing.tile-like surface feature.3.2.1.1 DiscussionSome prefaced units may also be referred to as glazed concrete masonry units.1 This specification is under the jurisdiction of ASTM Committ
11、ee C15 on Manufactured Masonry Units and is the direct responsibility of Subcommittee C15.03 onConcrete Masonry Units and Related Units.Current edition approved July 1, 2014Feb. 1, 2016. Published August 2014February 2016. Originally approved in 1973. Last previous edition approved in 20112014 asC74
12、4 11.C744 14. DOI: 10.1520/C0744-14.10.1520/C0744-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This doc
13、ument is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as
14、 appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Unite
15、d States13.2.2 prefaced calcium silicate masonry unit, na calcium silicate masonry unit where the exposed-to-view in-place surface(s)finished face(s) are covered at the point of manufacture with either resin, resin and an inert filler, or cement and an inert filler toproduce a smooth, resinous tile
16、facing.tile-like surface feature.3.2.2.1 DiscussionSome prefaced units may also be referred to as glazed calcium silicate masonry units.4. Materials4.1 Concrete masonry units on which prefaced surfaces are molded shall meet the requirements of:4.1.1 Specification C55 for Concrete Building Brick.4.1.
17、2 Specification C90 for Loadbearing Concrete Masonry Units.4.1.3 Specification C129 for Nonloadbearing Units.4.2 Calcium silicate units on which prefaced surfaces are molded shall meet the requirements of Specification C73 for CalciumSilicate Brick (Sand-Lime Brick).NOTE 1The purchaser of prefaced u
18、nits should indicate the applicable specification and the type and grade of unit required. Where prefaced unitsare required for exterior use, the manufacturer should be consulted for material suitable for this purpose.5. Facing Requirements5.1 Resistance to Crazing, Cracking, or SpallingThere shall
19、be no crazing, cracking, or spalling of the facing material whenthe unit is tested in accordance with 7.2.5.2 Resistance to ChemicalsThe condition of the surface shall show no change after testing with each of the chemicals listedin 7.3.5.3 AdhesionWhen viewed without magnification, there shall be n
20、o failure of the adhesion of the facing material to the unitsubsequent to failure of the entire prefaced unit when tested in compression in accordance with 7.4.5.4 AbrasionThe wear index shall exceed 130 when tested in accordance with 7.5.5.5 Surface Burning Characteristics CharacteristicsWhen teste
21、d in accordance with 7.6, the surfaces of the prefaced unitsshall have a flame spread classification not greater than 25 without evidence of continued progressive combustion and shall havea smoke density rating not greater than 50.5.6 Color, Tint, or TextureColor, tint, or texture shall be as specif
22、ied. When tested in accordance with 7.7 and then comparedwith an unexposed unit, there shall be no change in texture, and color differences shall not exceed 5.0 Delta units.5.7 Soiling and CleansabilityThere shall not be a stain visible when specimens are tested in accordance with 7.8.1 and thenview
23、ed from a distance of 10 ft (3m) (3 m) under an illumination of not less than 50 fc (538.2 lm/m2) by an observer with normalvision. Spotting media shall be observed to be completely removed from specimens when tested in accordance with 7.8.2 and 7.8.3and then viewed from a distance of 10 ft (3 m) un
24、der an illumination of not less than 50 fc (538.2 lm/m2) by an observer withnormal vision.5.8 ReportTest reports shall show the results of tests required by 5.1 through 5.7.6. Dimensional Tolerances6.1 Face DimensionThe total variation from specified dimensions in the finished face dimensions of the
25、 units shall not exceed6116 in. (1.6 mm) from specified dimensions.6.2 DistortionThe distortion of the plane and edges of the face of individual units from the corresponding plane surface andedges of the unit shall not exceed 116 in. (1.6 mm).7. Sampling and Testing7.1 The purchaser or authorized re
26、presentative shall be accorded proper facilities to inspect and sample the prefaced units at theplace of manufacture from the lots ready for delivery.7.2 CrazingResistance to crazing of prefaced units shall be determined by oven drying from a saturated condition inaccordance with the absorption test
27、ing procedure of Test Methods C140, allowing the specimen to cool to room temperature, andresaturating.7.3 Resistance to ChemicalsApply a convenient quantity of the chemicals, as shown in Table 1, one at a time on the facingmaterial and leave covered with a watchglass for the duration of the test pe
28、riod. For volatile chemicals, place a saturated wad underthe watchglass and keep saturated. Upon completion of the test period, wipe the test area clean with a clean cloth. The conditionof the test area shall show no change after testing with each chemical for the specified time prescribed in Table
29、1.C744 1627.4 Adhesion of FacingTest three prefaced units for compressive strength in accordance with Test Methods C140. Apply thecompressive load until failure of the entire unit occurs. Subsequent to failure of the entire unit, view without magnification theinterface between the unit and the facin
30、g material and note any adhesion failures.7.5 AbrasionDetermine the wear index in accordance with Test Method C501 using Taber Abraser Research Model 503 witha Taber CS-17 abrasive wheel and a 1000-g weight for 500 wear cycles.7.6 Surface BurningDetermine flame spread and smoke ratings in accordance
31、 with Test Method E84.7.7 Color ChangeDetermine color difference using CIE L*, a*, b*, or CIELAB (1976) with two-degree observer, illuminantC, and specular excluded in accordance with Test Method D2244. Take measurements before and after 500 h of acceleratedweathering using the single-arc apparatus
32、in accordance with Practice D822. Use test panels not less than 3 in. (76.2 mm) wideby 6 in. (152.4 mm) long. Test panels need not be conditioned.7.8 Soiling and Cleansability:7.8.1 Staining MediaPour a stain consisting of 0.5 g of oil-soluble dye (C.I. Solvent Orange 7, C.I. 12140), 1.0 g of lanoli
33、n,and 5.0 g of SAE 10 oil one at a time on an area approximately 12 in. (12.7 mm) in diameter on the preface side of units. Allowthe stain to remain on the specimens for a period of 4 days. Clean the specimen for 80 cycles in accordance with Test MethodD2486 using an industrial-grade cleaning agent.
34、 Examine the cleaned surface for the following degrees of intensity (see 5.7):7.8.1.1 Stain completely removed.7.8.1.2 Trace.7.8.1.3 Evident.7.8.1.4 Pronounced.7.8.1.5 Very pronounced.7.8.2 Spotting MediaApply each of the following stains on each specimen:7.8.2.1 Writing Pencil, No. 2Apply the penci
35、l soil by wedging it in a glass tube that fits snugly but floats freely in a woodenblock.Apply the soil by placing a 500-g weight on top of the pencil in such a manner that the soil is uniform in width and thickness.7.8.2.2 Magic MarkerApply the Magic-Marker soil by wedging it in a glass tube that f
36、its snugly but floats freely in a woodenblock. Apply the soil by placing a 500-g weight on top of the Magic Marker in such a manner that the soil is uniform in widthand thickness.7.8.2.3 LanolinSmear the lanolin on the surface using an artists or similar brush.7.8.2.4 Carbon PaperApply the carbon pa
37、per soil by placing a 500-g weight on 1 in.2 (645.2 mm2) of paper and drawing theweighted paper across the surface in a single stroke.7.8.3 Clean the stained areas as specified in 7.8.1 except as follows:7.8.3.1 Use 100 % isopropyl alcohol to clean the Magic-Marker medium; clean spotting of writing
38、pencil medium for 10 cycles;clean spotting of Magic-Marker medium for 150 cycles; clean spotting of lanolin and of carbon paper media for 60 cycles.8. Inspection8.1 All prefaced units shall be sound and free of cracks or other defects that interfere with the proper placing of the units orimpair the
39、strength or permanence of the construction.8.2 SurfaceThe coated surface shall be free of chips, crazes, cracks, blisters, crawling, holes, and other imperfectionsdetracting from the appearance of the units when viewed from a distance of 5 ft (1.5 m) perpendicular to the coated surface andusing dayl
40、ight without direct sunlight.9. Compliance9.1 If a sample fails to conform to the specified requirements, the manufacturer shall be permitted to remove units from theshipment. A new sample shall be selected by the purchaser from remaining units from the shipment with a similar configurationand dimen
41、sion and tested at the expense of the manufacturer. If the second sample meets the specified requirements, the remainingTABLE 1 Resistance to ChemicalsChemical Duration ofTest, hAcetic acid (CH3COOH) (5 %) 24Hydrochloric acid (HCl) (10 %) 3Potassium hydroxide (KOH) (10 %) 3Trisodium phosphate (Na3PO
42、4) (5 %) 24Hydrogen peroxide (H2O2) (3 %) 24Household detergent (10 %) 24Vegetable oil 24Blue-black ink 1Ethyl alcohol, industrial denatured (95 %) 3C744 163portion of the shipment represented by the sample meets the specified requirements. If the second sample fails to meet the specifiedrequirement
43、s, the remaining portion of the shipment represented by the sample fails to meet the specified requirements.NOTE 2Unless otherwise specified in the purchase order, the cost of tests is typically borne as follows: (1) if the results of the tests show that theunits do not conform to the requirements o
44、f this specification, the cost is typically borne by the seller; (2) if the results of the tests show that the unitsconform to the specification requirements, the cost is typically borne by the purchaser.10. Keywords10.1 calcium silicate masonry units; concrete masonry units; masonry units; prefaced
45、 unitsSUMMARY OF CHANGESCommittee C15 has identified the location of selected changes to this standard since the last issue(C744 11C744 14) that may impact the use of this standard. (Approved July (February 1, 2014)2016)(1) Added definitions forRevised the description prefaced masonry unitof the pre
46、faced units in 1.1to, 3.2.1the Terminology, and3.2.2sectionASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such pat
47、ent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn.Your comments are invited eith
48、er for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair h
49、earing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured fr
